Detection of Sleep and Wake States Based on the Combined Use of Actigraphy and Ballistocardiography

This paper presents a combined use of actigraphy and ballistocardiography to measure sleep stages without a disruptive sleep environment. Although polysomnography (PSG) is considered the gold standard for measuring sleep stages, the intrusive setup may lead to an unnatural sleep and impact the actual sleep quality. To address this issue a novel approach to measure sleep stages is presented by combining the acceleration measurements of actigraphy with the cardiological measurements of ballistocardiography. The combined measurements are compared with PSG for verification of the closest match possible with minimal interference for the sleeping individual. The experimental results of the study show that sleep/wake states can be classified accurately using the integrated approach.